Draft: Adding a group member makes them Enterprise User if meet the condition

What does this MR do and why?

Related to #388410 (closed)

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How to set up and validate locally

Remove Enterprise trait

user = User.find_by(email: 'bdenkovych@example.com')
user.user_detail.update!(provisioned_by_group_id: nil, provisioned_by_group_at: nil)

Create GitLab Pages custom domains

projec_pages = Project.find_by_path('pages')

projec_pages.pages_domains.create!(domain: 'unverified.example.com')
projec_pages.pages_domains.create!(domain: 'example.com')

projec_pages.pages_domains.create!(domain: 'gitlab.com')

# Verify domain
projec_pages.pages_domains.find_by(domain: 'gitlab.com').update!(verified_at: Time.current)

MR acceptance checklist

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